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Our handling of XML-RPC introspection is iffy as it is and this would
remove those methods completely. Can you add them back into the
xmlserver class?

Not just iffy, it's non-existent. See
https://fedorahosted.org/freeipa/ticket/2937.
The patch removes the __system dict which has been unused since at least
Jason's web UI work in 2009, Git tells me. The patch did leave the
actual methods.
Well, actually it's not that hard to get these working again; see
attached patch (which can be reviewed separately).

As an aside, I noticed that we no longer display the server we're trying
to contact in verbose mode (ipa -vv). This was often help in diagnosing
problems, particularly with the fallback routines. Not related to these
patches though.